= 0, bg-dark: main.skin === 31, bg-primary: [22,32].indexOf(main.skin)
= 0, bg-warning: [25,35].indexOf(main.skin)
= 0
= 0, bg-success: [23,33].indexOf(main.skin)
= 0, bg-info-alt: [24,34].indexOf(main.skin)
= 0, bg-dark: [31,32,33,34,35,36].indexOf(main.skin)
= 0, bg-danger: [26,36].indexOf(main.skin)
